Megmeet drives – what are the benefits of using drives?

1. Energy saving of frequency conversion speed regulation

1) Due to the use of frequency conversion speed regulation, the energy-saving effect of fans and pump loads is the most obvious, and the power-saving rate can reach 20%-60%, this is because the power consumption of the fan pump is proportional to the cubic of the speed, when the average flow required by the user is small, the speed of the fan and pump is low, and the energy-saving effect is also very considerable. However, when the traditional baffle and gate are used for flow regulation, the power consumption does not change much. Because there are many such loads, accounting for about 20%-30% of the total capacity of AC motors, their energy saving is of great significance.

2) For some constant torque loads running at low speed, such as conveyor belts, frequency conversion speed regulation can also save energy. In addition, the original speed regulation mode consumes more energy (such as winding rotor motors, etc.), the original speed regulation mode is more complex, and the efficiency is lower (such as gantry planer, etc.), after the use of frequency conversion speed regulation, the energy-saving effect is also obvious.

2. The advantages of frequency conversion speed regulation in the operation of the motor

1) Frequency conversion speed regulation is easy to realize the forward and reverse rotation of the motor. It is only necessary to change the switching sequence of the inverter inside the inverter to achieve output commutation, and there is no problem of burning the motor due to improper commutation.

2) Most of the starting points of the frequency conversion speed regulation system start from low speed, and the frequency is low. The acceleration and deceleration time can be set arbitrarily, so the acceleration and deceleration time is relatively gentle, the starting current is small, and the start and stop of higher frequency can be carried out.

3) When braking the frequency conversion speed regulation system, the frequency converter can use its own braking circuit to consume the energy of the mechanical load on the braking resistor, and can also feed back to the power supply grid, but the feedback to the power grid needs to add special accessories, and the investment is large. In addition, the inverter also has a DC braking function, when braking is required, the inverter adds a DC voltage to the motor for braking, and there is no need to add a braking control circuit.

4) The inverter can replace the DC engine, and the induction motor is used. As with DC engines, there is no need for brushes, slip-rings, etc., and it has excellent maintainability and environmental resistance.

5) One inverter can operate several engines in parallel

6) The inverter can be soft start and soft shut-off, and the acceleration/deceleration time of the engine can be adjusted arbitrarily.

7) Reduce the starting current. Through the soft start and soft shutdown of the inverter, the starting current can be reduced to 1.5-2 times of the rated current when the motor is started. In general, in the case of direct starting, the starting current is 6 times the rated current, so it puts a load on the frequent operation and stopping of the motor.

8) The upward braking of the inverter is convenient for electric braking.

3. Application for the purpose of improving process level and product quality

In addition to the application of variable frequency speed regulation in fans and pump loads, it can also be widely used in various mechanical equipment control fields such as transmission, winding, lifting, extrusion, and machine tools. It can improve the peculiar yield rate, prolong the normal working cycle and service life of the equipment, simplify the operation and control system, and even change the original process specifications, thereby improving the control level of the entire equipment.

When selecting an inverter configuration, it is necessary to fully grasp the load characteristics, but it is also difficult to do.

1. Confirm the characteristics of the load such as load type, speed, and nature;

2. Check whether it is continuous operation, long-term operation, short-term operation, etc.

3. Confirm the maximum consumption output value and the rated output value;

4. Confirm the maximum number of revolutions and the rated number of revolutions;

5. Confirm the speed control range;

6. Confirm load changes, current, voltage, frequency, temperature changes, etc.;

7. Confirm the required control precision;

8. Confirm the braking method;

9. Confirm the input power configuration. In other words, the capacity is selected based on factors such as speed-torque characteristics, overload capacity, time rating, starting torque, rated output value, operation mode, control mode, number of revolutions, efficiency-power, and so on.

However, it is not easy to select the inverter configuration in the above way. Therefore, ordinary users can choose the inverter according to the motor configuration. First, select the configuration voltage (220V, 380V, 440V) and then select the inverter capacity according to the engine capacity (kW). Generally, products with low starting torque and load, such as fans and pumps, use engines and inverters with a capacity of 1:1; For elevators, cranes, etc., which require more torque and large load, select an inverter whose capacity is one stage higher than that of the motor.

Megmeet drives – what are the benefits of using drives?

Megmeet drives – what are the benefits of using drives?

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